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Classes of Magnetic Materials
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Magnetic susceptibility
quantitative measure of the extent to which a material may be magnetized in relation to a given applied magnetic field
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Diamagnetic
have a weak, negative susceptibility to magnetic fields.
slightly repelled by a magnetic field does not retain the magnetic
properties when the external field is removed
most elements in the periodic table, including copper, silver, and gold
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Paramagnetic
have a small, positive susceptibility to magnetic fields
slightly attracted by a magnetic field does not retain the magnetic
properties when the external field is removed
magnesium, molybdenum, lithium, and tantalum
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Ferromagnetic
have a large, positive susceptibility to an external magnetic field
exhibit a strong attraction to magnetic fields
able to retain their magnetic properties after the external field has been removed
strong magnetic properties due to the presence of magnetic domains
iron, nickel, and cobalt
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Magnetic Domains
cause of the strong magnetic property of ferromagnetic materials
region of 1012 to 1015 atoms when magnetic moments of these
atoms are aligned parallel the material is said to be “magnetized”
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Magnetized vs unmagnetized